Absolutely spot on HercFeend. This thread is very misleading
Bad medicine is correct BUT this work which arose from a massive study of Finnish conscripts only works if you have had asthma in the last few months.
In my opinion, you have not had asthma based on your history. You had a cough and a GP gave you an inhaler which you only used once. There is no record of peak flows when you presented nor when you used the inhaler. The fact that a prescription was issued is irrelevant, the issue is whether you took the drug and you did not.
If you can also say that the cough lasted only days or weeks, it is far more likely to have been an infection rather than asthma.
Taking all this together, the prescribing of an inhaler may have been sensible but wrong, and there is no evidence of asthma.
you may well be refused if you TOOK an inhaler, but you didnt. Check it out.
I would also recommend that before you apply you ask to see your notes - you have a legal right to do so - and ensure there is nothing you disagree with. You also have a right to add an amendment if you disagree, but if you never saw the doctor again for asthma and there is no further entry about asthma that too suggests the initial hypothesis was wrong.
Best wishes